/*******************************************************************************
 * Copyright 2006, 2017 Jerry Huxtable, Martin Davis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This file was semi-automatically converted from the public-domain USGS PROJ source.
 */
package org.locationtech.proj4j.proj;

import org.locationtech.proj4j.ProjCoordinate;

public class Wagner3Projection extends PseudoCylindricalProjection {
	
	private final static double TWOTHIRD = 0.6666666666666666666667;

	private double C_x;

	public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate xy) {
		xy.x = C_x * lplam * Math.cos(TWOTHIRD * lpphi);
		xy.y = lpphi;
		return xy;
	}

	public ProjCoordinate projectInverse(double x, double y, ProjCoordinate lp) {
		lp.y = y;
		lp.x = x / (C_x * Math.cos(TWOTHIRD * lp.y));
		return lp;
	}

	public void initialize() {
		super.initialize();
		C_x = Math.cos(trueScaleLatitude) / Math.cos(2.*trueScaleLatitude/3.);
		es = 0.;
	}

	public boolean hasInverse() {
		return true;
	}

	public String toString() {
		return "Wagner III";
	}

}
